Dynamics of microbial activities and community structures in activated sludge under aerobic starvation. (November 2017)

• Record Type: Journal Article
• Authors: Liu, Wenlong; Peng, Yongzhen; Ma, Bin; Ma, Linna; Jia, Fangxu; Li, Xiyao
• Is Part Of: Bioresource technology. Volume 244:Part 1(2017)
• Page Start: 588
• Page End: 596
• Publication Date: 2017-11
• Subjects: Aerobic starvation -- Nitrifiers -- PAOs -- Cell decay -- Recovery -- Microbial community; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.07.131
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Recovery periods of nutrient removal prolonged with the aerobic starvation time. Nitrite accumulation was achieved by the slower activity recovery of NOB than AOB. Nitrifiers keep growing during 7 days' aerobic starvation and then gradually decay. PHA, glycogen and poly-P were utilized by PAOs to provide energy for maintenance. Proteobacteria and Bacteroidetes decline while a remarkable increase of Firmicutes . Abstract: The knowledge of the effect of aerobic starvation on the functional bacterial activities and community structures is important for the recovery of nutrient removal in activated sludge system. Four aerobic starvation processes (3, 7, 14 and 30 days) for nitrifiers and polyphosphate accumulating organisms (PAOs) were studied. The results showed that nitrifiers could utilize the released ammonium for growth during the first 7 days of the aerobic starvation, and then gradually decayed. In the recovery period, the slower recovery ability of nitrite-oxidizing bacteria (NOB) than ammonium-oxidizing bacteria (AOB) contributed to the nitrite accumulation. Besides, the sequential consumption of polyhydroxyalkanoates (PHA), glycogen and the utilization of polyphosphate (poly-P) in PAOs provided the energy to maintain bacterial metabolic activity. High-throughput sequencing analysis revealed that aerobic starvation had substantial impacts on the succession of microbial community, and the majority of original dominant species within the phylum Proteobacteria and Bacteroidetes declined while Firmicutes increased.